Jeans fabric with warp and weft elastic

Abstract

This utility model discloses a warp and weft double-elastic denim fabric, including an inner layer (1) and an outer layer (2); the inner layer (1) is a 1 / 3 broken twill weave made of a first warp yarn and a first weft yarn, and the outer layer (2) is a 2 / 1 right twill weave made of a second warp yarn and a second weft yarn; the second warp yarn and the second weft yarn are both made of double core-spun fibers, the inner core of the double core-spun fibers is spandex filament, the middle sheath is polyester, and the outer sheath is cotton fiber.

Description

Technical Field

[0001] This utility model relates to a denim fabric, and more particularly to a warp and weft double-elastic denim fabric. Background Technology

[0002] Classic denim fabric is generally non-stretch, with 100% cotton warp yarns. To increase the elasticity of denim, researchers began developing four-way stretch denim fabrics. However, traditional four-way stretch denim fabrics typically use spandex core-spun yarn (such as cotton-wrapped spandex) to provide weft elasticity, while using ordinary cotton yarn or low-elasticity polyester / viscose yarn (providing limited warp elasticity) in the warp. Overall, the elasticity is generally poor, failing to maintain good elasticity in both warp and weft directions. Therefore, there is an urgent need to develop a denim fabric that can maintain good elasticity in both warp and weft directions. Utility Model Content

[0003] The purpose of this invention is to provide a warp and weft double-stretch denim fabric. This invention features the ability to maintain good elasticity in both warp and weft directions.

[0004] The technical solution of this utility model is: a warp and weft double-elastic denim fabric, including an inner layer and an outer layer; the inner layer is a 1 / 3 broken twill weave made of a first warp yarn and a first weft yarn, and the outer layer is a 2 / 1 right-hand twill weave made of a second warp yarn and a second weft yarn; both the second warp yarn and the second weft yarn are double-core filaments, the inner core of the double-core filament is spandex filament, the middle sheath is polyester, and the outer sheath is cotton fiber.

[0005] In the aforementioned warp and weft double-stretch denim fabric, the first warp yarn is made of spandex core-spun yarn, and the first weft yarn is composed of a composite yarn made of cotton yarn and polyester fiber, alternating with spandex.

[0006] In the aforementioned warp and weft double-stretch denim fabric, the first weft yarn has a wavy pattern; and the wavelength of the first weft yarn is 3-5mm and the wave height is 0.2-0.3mm.

[0007] Compared with existing technologies, this invention consists of a surface layer with a 2 / 1 right-hand twill weave and an inner layer with a 1 / 3 broken twill weave, which not only reveals the traditional denim texture but also forms a high-elastic mesh base, thus improving the fabric's elasticity to a certain extent. Meanwhile, the surface layer of this application is woven with a double-core fiber warp and weft, consisting of an inner core of spandex filaments (providing elasticity), a middle sheath layer of polyester (a low-elasticity chemical fiber filament, providing skeletal support, resilience, and reducing spandex load), and an outer sheath layer of cotton fibers (providing the natural look, feel, moisture absorption, and dyeability of denim). This allows the fabric to quickly return to its original shape after stretching, reducing loosening deformation and achieving all-around elasticity. In summary, this invention has the characteristic of maintaining good elasticity in both warp and weft directions. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model.

[0009] The labels in the attached diagram are: 1-inner layer, 2-outer layer. Detailed Implementation

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0011] Example. Warp and weft double-stretch denim fabric, constructed as follows: Figure 1 As shown, it includes an inner layer 1 and an outer layer 2; the inner layer 1 is a 1 / 3 broken twill weave made of the first warp yarn and the first weft yarn, and the outer layer 2 is a 2 / 1 right twill weave made of the second warp yarn and the second weft yarn; the second warp yarn and the second weft yarn are both made of double core-spun fibers, the inner core of the double core-spun fibers is spandex filament, the middle sheath is polyester, and the outer sheath is cotton fiber.

[0012] The first warp yarn is made of spandex core-spun yarn, and the first weft yarn is composed of a composite yarn made of cotton yarn and polyester fiber, alternating with spandex.

[0013] The first weft yarn has a wavy pattern; and the wavelength of the first weft yarn is 3-5mm and the wave height is 0.2-0.3mm.

[0014] The outer and inner layers are connected by a knotting yarn, which is made of 50D polyester filament and runs through the two layers in a manner of "3 wefts interspersed with 1 weft". When the fabric is stretched, the knotting yarn unfolds in an "S" shape (elongation compensation of 15-18%).

[0015] Preferably, the inner grid cell size is 0.8mm × 1.2mm (optimal flexible storage ratio).

[0016] Preparation process of double core-spun fiber: Step 1, pre-stretching and coating: Spandex yarn passes through the first roller group at a stretch ratio of 1.8-2.2;

[0017] Step 2, First wrapping: The intermediate sheath layer is wrapped in a Z-direction spiral (wrapping angle 25-30°) using a hollow spindle wrapping spinning machine (speed 9000-12000 rpm);

[0018] Step 3, Secondary wrapping

[0019] The outer sheath layer is twisted by a ring spinning device to wrap polyester fibers in the opposite direction of the S twist (wrapping angle 15-20°, forming torque balance with the middle sheath layer).

[0020] The first weft yarn consists of alternating cotton / polyester composite yarn and spandex, arranged in a 3:1 ratio (3 composite yarns to 1 spandex filament).

[0021] Preferably, the polyester fiber has a trilobal cross-section and accounts for 35±2%.

[0022] The spandex core-spun yarn has a three-layer composite structure. The core layer is made of 20-30D spandex yarn (elongation at break ≥500%, preferably DuPont). T400 model); the sheath layer includes: inner layer: long-staple cotton fiber (length ≥28mm, micronaire value 3.8-4.2), outer layer: polyester / cotton blend (65 / 35 ratio).

[0023] The yarn structure of the second warp and second weft yarns is a three-layer "core-sheath-sheath". The inner core is spandex filament (providing elasticity), the middle sheath layer is low-elasticity chemical fiber filament (polyester) (providing skeletal support, resilience, and reducing spandex load), and the outer layer is cotton fiber (providing the natural look, feel, moisture absorption, and dyeability of denim).

[0024] The double-core-spun fiber structure provides strong and lasting elasticity, ultimately achieving truly balanced and durable four-way elasticity. It also improves fatigue resistance and durability (reduced spandex load: the middle chemical fiber filaments (such as polyester) bear some of the stress, acting as a "skeleton" support, reducing the direct load on spandex during stretching and delaying its aging. The fabric's elastic life is greatly extended, maintaining excellent elasticity and resilience even after repeated wear and washing, and is less prone to losing its elasticity). Good dimensional stability: the chemical fiber filaments and spandex in the double-core-spun fiber structure work together to reduce shrinkage and deformation after wetting and heat treatment (such as washing, drying, and ironing), resulting in greater dimensional stability. Breathable and moisture-wicking: the moisture-wicking and breathable properties of cotton fibers are retained, providing superior wearing comfort compared to all-chemical fiber stretch fabrics. Improved processing performance: the addition of chemical fiber filaments (polyester) to the warp and weft yarns typically increases yarn strength, which is beneficial for high-speed weaving and reduces the breakage rate during weaving.

[0025] The fabric has a more stable overall structure, which can reduce the difficulty of finishing processes (such as reducing excessive shrinkage, curling, etc.).

[0026] Fabric advantages: It allows the fabric to quickly return to its original shape after stretching, reduces loosening and deformation, achieves all-round elasticity, and meets the high comfort requirements of sportswear and casual wear.

Claims

1. A warp and weft elastic denim fabric, characterized in that: It includes an inner layer (1) and an outer layer (2); the inner layer (1) is a 1 / 3 broken twill weave made of the first warp and the first weft, and the outer layer (2) is a 2 / 1 right twill weave made of the second warp and the second weft; the second warp and the second weft are both made of double core-spun fibers, the inner core of the double core-spun fibers is spandex filament, the middle sheath is polyester, and the outer sheath is cotton fiber.

2. The warp and weft elastic denim fabric according to claim 1, characterized in that: The first warp yarn is made of spandex core-spun yarn, and the first weft yarn is composed of a composite yarn made of cotton yarn and polyester fiber, alternating with spandex.

3. The warp and weft elastic denim fabric according to claim 1, characterized in that: The first weft yarn has a wavy pattern; and the wavelength of the first weft yarn is 3-5mm and the wave height is 0.2-0.3mm.

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